Cant put links

When I select some text and click on the link icon, I see a popup div, but the div has all the php variables instead of labels ( {$lang_insert_link_url} etc.). I also see a javascript error. When I enter the URL and click on {$lang_insert} button, nothing happens. :(

I could've posted a screenshot here, but looks like there's no such facility. :(

As a general first step, I would suggest the "cookie and cache" dance.

Log out of wordpress clear your browser cookies and cache, then log back in and try again and see what if it will work.

It may also be a browser issue. Do you have another browser, such as Firefox on your computer? If so, give it a try. If not, you can download firefox and give it a try. If it works, then you can continue to use firefox, if it does not, then you can always uninstall it.